In an observational study, you find that smokers tend to die…

In an observational study, you find that smokers tend to die earlier than non-smokers from certain diseases, such as cancer or heart disease.  Can you conclude that smoking causes the early development of diseases?  Why or why not?  (Select either Yes or No and then select all pertinent reasons)

You are treating a patient with third-degree burns on their…

You are treating a patient with third-degree burns on their anterior trunk and anterior head and neck.  In addition, they have second-degree burns on their anterior left arm.  What portion of the patient’s body has burns that cannot heal on their own?